const fs = require('fs')
const path = require('path')

//open
// fs.open(path.resolve('data.txt'),'r',(err,fd)=>{
//     console.log(fd);
// })

//close
fs.open(path.resolve('data.txt'),'r',(err,fd)=>{
    console.log(fd);
    fs.close(fd,err=>{
        console.log('关闭成功');
    })
})